Motor pulley



1933; c F ELLE l a fi MOTOR PULLEY Filed Nov. 5, 1928 C Vfii jmwwtoxr 1 fiozvmp 2 ELLE? f 3511 flf am s.

Patented Feb. 21, 1933 UNITED STATES PATENT OFFICE CONRAD F. ELLE, OF CHICAGO, ILLINOIS MOTOR PULLEY Applicationfiled November 5, 1928. ,Serial No. 317,352.

pulleys employed on electric motors for transmission of power to auxiliary appliances, and my main object is to provide a pulley which is without vibration.

construct the pulley which is changeable from the flat to the grooved type.

A still further object of the inventionis to employ a peculiar combination of parts to make up the pulley, whereby a novel action is used to transform the same from the flat to the grooved type.

A final, but nevertheless important object of the invention is to employ a minimum number of parts for the novel pulley, and to use no extra parts for the transformation thereof.

With the above objects in view and any others that may suggest themselves from the specification and claims to follow, a better understanding of the invention may be gained by reference to the accompanying drawing, in which- Figure 1 is a perspective view of a typical motor installation of the type suggested, having a flat belt drive from the same to an auxiliary unit;

Fig. 2 is a section of a motor pulley, showing the flat type; and

Fig. 3 is a similar section, showing the grooved type.

It has been customary in the case of mo tors of the class described to mount them with both a grooved pulley and a fiat pulley, the grooved pulley being first applied. However, the disposal of the two pulleys in succession has located the flat pulley so far from the motor that it set up vibration by centrifugal force. The vibration, in being transmitted to the installation and auxiliary tools driven by the motor has caused a generally unsatisfactory situation, and this it has been my intention to remedy by providing a pulley which accomplishes the objects outlined above to their fullest extent.

Referring specifically to the drawing, the 1 motor is shown at 5, its shaft at 6, an emery wheel tool 7 on the latter and a drill chuck 8 on an extension of the shaft. These parts are typical of installations of this kind and are'not fundamentally affected by'the novel pulley.

For the purpose of the present invention.

the shaft-6 is itself made as an extension of A further object of the inventlon is to the motor armature shaft 9, being formed with a socket 10 to receive the latter. The socket has one or more set screws 11 to se cure it to the armature shaft 9; also, near its inner end, the socket 10 has a beveled head 12, and at its outer end a shoulder 13 incidental to a reduction comprising the shaft 6. In assembling the novel pulley, the emery wheel 7 is an incidental consideration. Thus, this wheel is clamped from both sides by conical dished disks l t and 15, the disk 15 being backed against the shoulder 13 of the socket 10, and the disk 14 advanced to exert a clamping pressure by a nut 16 running on the threaded extension 6a of the shaft 6. At the inner end of the socket 10 is disposed a frusto-conical disk 17, whose inner portion seats upon the bevel of the socket head 12 as shown clearly in Figure 2. In the space between the disks 15 and 17 is disposed a cylindrical rim 1'8, consti- H tuting the flat pulley. While'the assembly of theseparts may be obvious from the drawing, it may be explained that first of all the 2 motor shaft and its socket receive but the disk 17 and the set screws 11; then, the rim 18, disk 15,.emery wheel7,-disk 14, and nut '85 16 follow in succession. The length of the rim 18 is calculated to receive pressure by the disk 15 equally with the socket 10, so that when the'disk is made to seat firmly against the socket shoulder 13 it will also firmly clamp the rim 18 between itself and the disk 17. Obviously, the ends of the rim will be beveled from Within to suit the obliquity'of the disks 15 and 17 and therefore permit the proper centering and uniform fitting of the rim18 by the wedging action of the disks. Thus, the disks support and clamp the rim. and a firm and durable pulley is formed by the assembly.

When the fiatpu'lley described is to be transformed into a grooved pulley for round or V-belts, the assembly is taken apart in self-evident order, and before it is put together again the rim 18 is discarded, the disk 15 turned about and the disk 17 also turned about and applied from the outer side of the disk 15 so as to rest on the hub 15a of the latter as clearly shown in Figure 3. The internal opening of the disk 17 is, of course, dimensioned originally to agree with the outer dimensions of the said hub, so that the change is readily made. Now, the tightening of the assembly forces the disk 17 to transmit pressure through the disk 15 so as to lodge the same firmly against the socketshoulder 13, enabling the pulley to be made tight as before. However, this time the put ley is formed by the V relation of the disks l5 and 17 as clearly shown, forming a suitable groove for a round or V-belt.

It will be seen that the novel expedient creates a composite pulley, which may be set close to the motor so as to create no vibra tion; also, the pulley is of a nature'to be transformed at will and by afew simple operations. No extra parts are involved, and the pulley structure is of a nature to be produced cheaply and maintained without repair or expense.

lVhile I have illustrated and described the invention in the preferred form, it will be evident that the same is capable of many minor changes and refinements and it is my intention to claim such changes and refinements as coming within the scope and spirit of the appended claims.

I claim: I

1. A convertible pulley comprising a pair of axially alined conical disks with inwardly-facing peripheries, and a hub inwardly extended from one of the disks, the other disk being made with a central opening of a size to receive the hub, said disks being adapted when spaced to receive a tubular pulley rim suitable as a flat pulley and when joined by the disposal ofthe hub in said opening to form a peripheral channel suitable as a V- pulley.

2. The structure of claim 1, said hubequipped disk also having a central openin a shaft passing through the disk openings, an abutment on the shaft inwardly of the hub, and an abutment on the shaft outwardly of said other disk, and means to urge the hub equipped disk in the direction of said other disk whereby to seat the hub against the first mentioned abutment and by means of the pulley rim when applied to press said other disk against the second mentioned abutment.

3. The structure of claim 1, said hubequipped disk also having a central openin a shaft passing through the disk openings, an annular shoulder on the shaft inwardly of the hub, and an abutment on the shaft outwardly of said other disk, and means to urge the hub-equipped disk in the direction of said other disk whereby to seat the hub against the first mentioned shoulder and by means of the pulley rim when applied to press said other disk against the second mentioned shoulder.

4. The structure of claim 1, said hubequipped disk also having a central opening, a shaft passing through the disk openings, an abutment on the shaft inwardly of the hub, and an abutment on the shaft outwardly of said other disk, and means to urge the hub equipped disk in the direction of said other disk whereby to seat the hub against the first mentioned abutment and by means of the pulley rim when applied to press said other disk against the second mentioned abutment, said other disk being hollow, and said further shoulder being beveled to seat the central portion of the disk.

5. A convertible pulley comprising a pair of axially alined conical disks with inwardly facing peripheries. a hub inwardly extended from one of the disks, the other disk being made with a central opening of a size to receive the hub, a shaft passing through the disk openings, an abutment on the shaft outwardly of the hub equipped disk, and means outwardly of said other disk urging the latter to press the hub-equipped disk upon the abutment and clamp the disks to form a V-grooved pulley.

In testimony whereof I ai'iix my signature.

CONRAD F. ELLE. 

